SB-900 warning tone?

Does anyone know if there's a way to set these units to beep a warning tone before it shots down from overheating? I have to blast it on full at times during events, with a million and one things happening. There's no time to check the temperature gauge on the unit after every shot. Does anyone know if this unit has such a feature? (I know, I'm too lazy to read the 200+ page manual).